Commit 6ffecc94 authored by Alex Sierra's avatar Alex Sierra Committed by Alex Deucher
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drm/amdkfd: skip migration for pages already in VRAM 



Migration skipped for pages that are already in VRAM
domain. These could be the result of previous partial
migrations to SYS RAM, and prefetch back to VRAM.
Ex. Coherent pages in VRAM that were not written/invalidated after
a copy-on-write.

Signed-off-by: default avatarAlex Sierra <alex.sierra@amd.com>
Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 1ade5f84

drivers/gpu/drm/amd/amdkfd/kfd_migrate.c

+7 −9
Original line number Diff line number Diff line
@@ -293,15 +293,13 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange, 
	for (i = j = 0; i < npages; i++) {

		struct page *spage;



		spage = migrate_pfn_to_page(migrate->src[i]);

		if (spage && !is_zone_device_page(spage)) {

			dst[i] = cursor.start + (j << PAGE_SHIFT);

			migrate->dst[i] = svm_migrate_addr_to_pfn(adev, dst[i]);

			svm_migrate_get_vram_page(prange, migrate->dst[i]);



			migrate->dst[i] = migrate_pfn(migrate->dst[i]);

			migrate->dst[i] |= MIGRATE_PFN_LOCKED;



		if (migrate->src[i] & MIGRATE_PFN_VALID) {

			spage = migrate_pfn_to_page(migrate->src[i]);

			src[i] = dma_map_page(dev, spage, 0, PAGE_SIZE,

					      DMA_TO_DEVICE);

			r = dma_mapping_error(dev, src[i]);